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Fig. 2. Effects of bolus injections (2 and 10 µg kg-1) of adrenaline, phenylephrine and isoproterenol on haemodynamic variables in anaesthetised South American rattlesnakes Crotalus durissus: (A) Psys, mean systemic blood pressure; (B) PCV, central venous blood pressure; (C) fH, heart rate; (D) MCFP, mean circulatory filling pressure; (E) pul, pulmonary cardiac output; (F) sys, systemic cardiac output. Black bars represent control values. Grey bars represent values after injection of the various adrenergic agonists. Values are means ± S.E.M. (N=6). Asterisks indicate a significant difference relative to control values. (1 cm H2O=0.098 kPa.)





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